Sanding block



April 20, 1937. Q Q ENGE 2,077,405

SANDING BLOCK Filed March 7, 1936 2.9 26 27 31 Cz'a'amei'mvamon @Y my 2mATTORNEY Patented Apr. 20, 1937 UNITED STATES PATENT OFFICE ApplicationMarch 7, 1936, Serial No. 67,724

Claims.

'I'he invention relates to a sand paper holder and more particularly toa sanding or polishing n carries a resilient covering piece so thatwhen` sand paper or emery cloth is attached to the block a smoother nishto a piece of work is assured and also eliminates premature wear of theemery cloth or sand paper.

2o A further object of the invention is the provision of a block of thischaracter, which is simple in construction, thoroughly reliable andelective in its purpose, strong, durable and inexpensive to manufacture.

With these and other objects in view, the invention consists in thefeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described, illustrated in the accompanyingdrawing, which discloses the preferred embodiment of the invention andpointed out in the claims hereunto appended.

In the accompanying drawing:

Figure 1 is a top plan view of a block constructed in accordance withthe invention and partly in section. y

Figure 2 is an end elevation thereof.

Figure 3 is a longitudinal sectional view ltaken on the line 3-3 ofFigure l looking in the direction of the arrows.

Figure 4 is a sectional view on the line 4-4 of Figure l looking in thedirection of the arrows.

Figure 5 is a perspective view of one of the gripping balls employedwith the block.

Figure 6 is a view similar to Figure 1 showing 15 a modified form.

Figure '7 is a sectional view on the line 'I-l of Figure 6 looking inthe direction of the arrows.

Figure 8 is a fragmentary horizontal detailed sectional view takenapproximately on the line I-- of Figure 9.

Figure 9 is a sectional view on the line 9--9 of Figure 8.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawinz.

Referring to the drawing in detail. particularly Figures 1 to 5inclusive, A designates generally a block preferably made from-woodhaving a sunken area in its top to provide upwardly divergent ledges IIIwhile about the bottom working face and opposite longer sides of theblock A is trained a resilient piece II, its side edges being carried onto the ledges l0 and made secure thereto by metal retaining strips I2,these being secured in place by fasteners I3. 10

Located in the sunken top of the block A is a plate I4 of metal, thesame being of the required width and length and is made secure or xed byfasteners I5 which are driven into the block A through the top thereof.Riveted to this plate 15 are latching cams i6, these being adapted toswing on the rivets I1 which function as pivots therefor for bitingengagement with a pair of clamping hails IB swingingly supported uponpivots I9 carried in downturned ends 20 of the plate 20 I4 andaccommodated within insets 2l provided in opposite ends of said block A.These ballsV I8 are adapted to be swung to a gripping position to engagewith overlapping edges 22 with relation to the strips I2 of a piece ofsand paper 23 which 25 is adapted to be wrapped about the block A andoverlie the resilient piece II which constitutes a backing for saidpiece of sand paper 23.

The latching cams I6 are formed with nger engaging extensions 24 so thatthey can be read- 30 ily manually manipulated for shifting the same intolatching or unlatching position. These latching cams have serrated edges25 so as to assure a positive and firm grip upon the hails i8 to avoidslipping of these latching cams when 35 thrown into latching position tohold the balls in clamping engagement with the overlapping edges 22 ofsaid piece of sand paper 23.

The sand paper 23 when wrapped about the block A will be backed by theresilient piece Il 40 for the cushioning of such sand paper 23 in theuse of the block for sanding purposes.

In Figures 7, 8 and 9 of the drawing there is shown a slightmodification wherein the latching cams 26 are formed with externallyratchet faced 45 hubs 21, these being journaled on pivot bolts 28mounted in a housing 29 beneath the plate 30 which is similar to theplate I4 and within this housing 29 is a ratchet spring 3| the samebeing adapted to play against the ratchet faced hubs 50 21 of the cams26 so that ratchet action is had when these cams 26 are moved intolatching or unlatching positions, the ratchet action being effective inthrowing the cams 26 in either direction. 55

It is preferable to have the balls I8 provided with a central nib 32 forbiting engagement with the serrated edges 25 of such cams I6.

It is, of course, understood that in lieu of the sanding paper 23 otherabrasive material may be used, as for example, emery cloth serviceablefor polishing purposes.

While it has been stated that preferably the block A is made from woodthe same may be made from metal, such as aluminum, if found desirable.

What is claimed is:

l. As an article of manufacture a block having a sunken top providingangled ledges opposite r each other at the sunken top, a pair oflatching cams swingingly supported in the sunken top, and clamping bailsswingingly carried by the block and movable between the cams and saidledges for the clamping of abrasive material when wrapped about theblock.

2. As an article of manufacture a block having a sunken top providingangled ledges opposite each other at the sunken top, a pair of latchingcams swingingly supported in the sunken top. clamping balls swinginglycarried by the block and movable between the cams and said ledges forthe clamping of abrasive material when wrapped about the block fixedthereon, and a resilient backing on the block for said abrasivematerial.

3. As an article of manufacture a block having a sunken top providingangled ledges opposite each other at the sunken top, a pair of latchingcams swingingly supported in the sunken top, clamping balls swinginglycarried by the block and movable between the cams and said ledges forthe clamping of abrasive material when wrapped about the block xedthereon, a resilient backing on the block for said abrasive material,and ratchet means coacting with said cams.

4. As an article of manufacture a block having a sunken top providingangled ledges opposite each other at the sunken top. a pair of latchingcams swingingly supported in the sunken top, clamping bails swinginglycarried by the block and movable between the cams and said ledges forthe clamping of abrasive material when wrapped about the block fixedthereon, a resilient backing on the block for said abrasive material.ratchet means coacting with said cams. and serrations formed at theworking edges of said cams.

5. As an article of manufacture a block having a sunken top providingangled ledges opposite each other at the sunken top, a pair of latchingcams swingingly supported in the sunken top. clamping balls swinginglycarried by the block and movable between the cams and said ledges forthe clamping of abrasive material when wrapped about the block xedthereon, a resilient backing on the block for said abrasive material,ratchet means coacting with said cams, serrations formed at the workingedges of said cams. and spurs on the bails cooperating with said ser`rations.

CONRAD CHRISTIAN ENGE.

